[Elecraft] KPA1500 Linearity

[K9MA]

I did look at the K3 output, and it's much, much better than the KPA1500 output.  I also checked that the KPA1500 supply voltage was not dropping much: 53 V in standby, 52 V at 1500 W.

73,
Scott K9MA 

----------

Scott Ellington

 --- via iPad

> On Jun 9, 2018, at 7:26 PM, Wes Stewart <wes_n7ws at triconet.org> wrote:
> 
> I don't have a KPA1500 or enough power attenuators to test my KPA500, but I have spent many dozens of hours looking at TX IMD on my two K3s.
> 
> I will simply say, if you haven't already, check the IMD of the bare K3 before blaming the KPA1500. Garbage in, garbage out.  That of course doesn't pardon the KPA for dropping gain.
> 
> Wes  N7WS
> 
> 
>> On 6/9/2018 2:21 PM, K9MA wrote:
>> I recently ran a two-tone test and measured CW power gain. (SN1078) It doesn't look good.  The two-tone waveform shows distinct "flat-topping", and the power gain drops 25 percent from 1000 to 1500 Watts.  My old 3-500Z amplifier is much better.  Has anyone measured IMD or linearity, or seen any test results?
>> 
>> While I'm primarily a CW operator, I'd be very reluctant to use the amplifier on SSB.
>> 
>> 73,
>> 
>> Scott K9MA
>> 
> 
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